iPod 3G FW/USB cable

I have a 3G iPod, and only a FW cable for it. I know that the Windows 3G iPods had a dual FW/USB cable so that one could charge the iPod and sync it with a PC at the same time. I've got a G4 mini and I hate dropping it in the cradle and waking the mini when it detects a new device, so I'd like a cable I can plug into the wall with the FW port and only plug into the mini with USB as needed. I k now someone has one of these cables siting in a drawer somewhere...